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United States Patent | 6,014,208 |
Welbourn ,   et al. | January 11, 2000 |
In order to test whether a diamond has had a layer of synthetic diamond deposited thereon, it is irradiated with high energy ultraviolet radiation to cause emission of luminescence, the luminescence intensity produced by different zones of the diamond being measured and compared. In one embodiment an integrating enclosure (15) is used and the diamond (13) is mounted on a rotatable mount (14).
Inventors: | Welbourn; Christopher Mark (Waltham St. Lawrence, GB); Smith; Martin Phillip (Wargrave, GB); Smith; James Gordon Charters (High Wycombe, GB); Spear; Paul Martyn (Maidenhead, GB); Martineau; Philip Maurice (Littlewick Green, GB); Cooper; Martin (Marlow, GB) |
Assignee: | Gersan Establishment (LI) |
Appl. No.: | 000098 |
Filed: | March 27, 1998 |
PCT Filed: | July 22, 1996 |
PCT NO: | PCT/US96/01751 |
371 Date: | March 27, 1998 |
102(e) Date: | March 27, 1998 |
PCT PUB.NO.: | WO97/04302 |
PCT PUB. Date: | February 6, 1997 |
Jul 24, 1995[GB] | 9515143 |
Current U.S. Class: | 356/237.1; 356/239.1; 356/239.7 |
Intern'l Class: | G01N 021/00 |
Field of Search: | 356/30,237,432,301,317,318,417 250/458.1,459.1,461.1,461.2 |
4284897 | Aug., 1981 | Sawamura et al. | 250/461. |
4799786 | Jan., 1989 | Gerrard | 356/30. |
5118181 | Jun., 1992 | Yifrach et al. | 356/30. |
5406367 | Apr., 1995 | Sopori | 356/30. |
5536943 | Jul., 1996 | Smith et al. | 250/372. |
Foreign Patent Documents | |||
82201315 | Jun., 1991 |